Step-Down DC/DC Controller
Target Datasheet
Features
•
•
•
•
•
•
•
•
•
•
•
•
Operation from 5V to 60V Input Voltage
100% Maximum Duty Cycle
Efficiency >90%
Output Current up to 3A
Less than 100µA Quiescent Current
2µA Max Shutdown Current
Up to 350kHz Switching Frequency
Adjustable and Fixed 5V and
V
IN
3.3V Output Voltage versions
3% output voltage accuracy
(PWM Mode)
Current-Mode Control Scheme
On Chip Low Battery Detector
Ambient operation range
-40°C to 125°C
R =
SI1
TLE 6389
P-DSO-14-3, -4, -9, -11
R
SENSE
=
0.05
M1
L
1
= 47
µH
V
OUT
I
OUT
C
IN1
=
100
µF
C
BDS
=
220 nF
11
13
BDS
VS
7
SI
CS
14
12
GDRV
2
R
SI2
=
Type
TLE 6389 GV
TLE 6389 G50
TLE 6389 G50-1
TLE 6389 G33
TLE 6389 G33-1
Ordering Code
on request
on request
on request
on request
on request
Package
P-DSO-14
P-DSO-14
P-DSO-14
P-DSO-14
P-DSO-14
Functional description
The
TLE6389
step-down DC-DC switching controllers provide high efficiency over loads
ranging from 1mA up to 3A. A unique PWM/PFM control scheme operates with up to a
100% duty cycle, resulting in very low dropout voltage. This control scheme eliminates
minimum load requirements and reduces the supply current under light loads to 100µA.
These step-down controllers drive an external P-channel MOSFET, allowing design
flexibility for applications up to 3A. A high switching frequency (up to 350kHz) and
Target Datasheet Rev. 1.7
1
2001-09-17
100k
400k
C
IN2
=
220nF
TLE6389G50-1
SYNC GND
5
4
6
ON
1
OFF
SI_GND SI_ENABLE
D1
100
µF
C
OUT
=
3
FB
VOUT
9
SO
10
RO
RD
8
M1: Infineon SPD09P06PL
D1: Motorola MBRD360
L1: Coilcraft DO3340P-473
Cin1: TBD
Cout: Low ESR Tantalum
C
RD
=100nF
Description
adjustable
5V, Device Enable
5V, SI GND, SI Enable
3.3V, Device Enable
3.3V, SI GND, SI Enable
TLE 6389
operation in continuous-conduction mode allow the use of tiny surface-mount inductors.
Output capacitor requirements are also reduced, minimizing PC board area and system
costs. The output voltage is preset at 5V (TLE6389-50) or 3.3V (TLE6389-33) and
adjustable for the
TLE6389.
Input voltages can be up to 60V.
Pin Configuration
(top view
)
ENABLE /
1
SI_EN
FB
2
VOUT
3
GND
4
SYNC
5
SI_GND
6
SI
7
14
CS
13
VS
12
GDRV
P-D-SO-14
11
BDS
10
RO
9
SO
8
RD
Pin Definitions and Functions
Pin No
SO-14
2
Symbol
FB
Function
Feedback Input.
1. For adjustable-output operation connect to an external voltage divider
between the output and GND (see the Setting the Output Voltage section).
2. Sense input for fixed 5V or 3.3V output operation. FB is internally
connected to an on-chip voltage divider.
VOUT Input.
Input for internal supply. Connect to output if variable version is used. For
fixed voltage version connect FB and VOUT.
3
VOUT
1
ENABLE
Active-Low Enable Input.
Device is placed in shutdown when Enable is
driven low. In shutdown mode, the reference, output, and external
MOSFET are turned off. Connect to logic high for normal operation.
(TLE6389G50, TLE6389G33, TLE6389GV only)
Target Datasheet Rev. 1.7
2
2001-09-17
TLE 6389
Pin No
SO-14
1
Symbol
SI_ENA
BLE
Function
SI Enable Input.
SI_GND is switched to high impedance when SI_Enable
is low. High level at SI_Enable connects SI_GND to GND via a low
impedance path. SO is undefined when SI_Enable is low. (TLE6389G50-
1, TLE6389G33-1 only)
Supply Input.
Bypass with 0.47µF.
Ground.
Analog signal ground.
SI Ground.
Ground connection for SI comparator resistor devider.
Buck Driver Supply Input.
Connect ceramic capacitor between BDS and
VS to generate clamped gate-source voltage to drive the PMOS power
stage.
Current-Sense Input.
Connect current-sense resistor between VS and
CS. External MOSFET is turned off when the voltage across the resistor
equals the current-limit trip level.
Gate Drive Output for External P-Channel MOSFET.
GDRV swings
between VS and BDS.
Reset Output.
Open drain output from reset comparator with an internal
pull up resistor.
Reset Delay.
Connect a capacitor to ground for delay time adjustment.
Sense Output Comparator.
Open drain output from SI comparator with
an internal pull up resistor.
Sense Input Comparator.
Input to the Low-Battery Comparator. This
input is compared to an internal 1.25V reference.
Input for external synchronization.
An external clock signal connected
to this pin allows for GDRV switching synchronization.
13
4
6
11
VS
GND
SI_GND
BDS
14
CS
12
10
8
9
7
5
GDRV
RO
RD
SO
SI
SYNC
Target Datasheet Rev. 1.7
3
2001-09-17
TLE 6389
1
Item
Absolute Maximum Ratings
Parameter
Supply Input
Symbol
Limit Values Unit
min.
max.
60
–
60
–
6.8
–
55
–
6.8
–
6.8
Remarks
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.0.9
1.0.10
1.0.11
Voltage
Current
Current Sense Input
Voltage
Current
Gate Drive Output
Voltage
Current
Voltage
Current
Feedback Input
Voltage
Current
SI_Enable Input
Voltage
V
S
I
S
V
CS
I
CS
V
GDRV
-0.3
–
-0.3
–
– 0.3
–
– 0.3
–
– 0.3
–
V
–
–
V
–
V
–
V
–
V
–
V
–
|V
S
–
V
GDRV
|<6.8V
Internally limited
|V
S
– V
BDS
|<6.8V
I
GDRV
V
BDS
Buck Drive Supply Input
I
BDS
V
FB
I
FB
V
SI_ENAB
– 0.3
LE
(TLE6389G50-1,
TLE6389G33-1
only)
1.0.12
Current
SI_GND Input
I
SI_ENABL
–
E
–
–
1.0.13
Voltage
V
SI_GND
– 0.3
60
V
(TLE6389G50-1,
TLE6389G33-1
only)
1.0.14
Current
I
SI_GND
–
–
–
Enable Input
Target Datasheet Rev. 1.7
4
2001-09-17
TLE 6389
1
Item
1.0.15
Absolute Maximum Ratings
(cont’d)
Parameter
Voltage
Symbol
V
ENABLE
Limit Values Unit
min.
– 0.3
max.
60
V
(TLE6389G50,
TLE6389G33,
TLE6389GV only)
Remarks
1.0.16
1.0.17
1.0.18
1.0.19
1.0.20
1.0.21
1.0.22
1.0.23
1.0.24
1.0.25
1.0.26
1.0.27
1.0.28
Current
Sense Input
Voltage
Current
Sense Output
Voltage
Current
VOUT
Input
Voltage
Current
Voltage
Current
Reset Output
Voltage
Current
Synchronization Input
Voltage
Current
I
ENABLE
V
SI
–
– 0.3
–
– 0.3
–
– 0.3
–
– 0.3
TBD
– 0.3
-2
– 0.3
TBD
–
60
–
6.8
–
15
–
6.8
TBD
6.8
2
6.8
TBD
–
V
–
V
–
V
–
V
mA
V
mA
V
mA
I
SI
V
SO
I
SO
V
OUT
I
OUT
V
RD
Reset Delay Adjust
Input
I
RD
V
RO
I
RO
V
SYNC
I
SYNC
ESD-Protection (Human Body Model; R=1,5kΩ; C=100pF)
1.0.29
all pins to GND
V
HBM
–2
2
kV
Target Datasheet Rev. 1.7
5
2001-09-17
